In my logs I am getting this error:
dzVents: Error: Multiple items found for Salon (device). Please make sure your names are unique or use ids instead
I know (and have checked) that I do not have multiple devices with the same name. In some way simular, yes.

Attached screenshots shows the results for all devices filtered by name Salon
As you can see there is only one device with that exact name, and then some that contain Salon in the name.

Clearly there are (computer says so ). Your method of checking isn't very effective. First of all you have to select All entries instead of just 25, then you have to sort by Name and only then you can tell if there are duplicates by name.

And if you switch to the current beta, dzVents will tell you exactly which devices was duplicate.

With all entries selected I get the same result (which makes sense because only if I would have more than 25 devices that contain salon I would miss some).
Will upgrade to latest Beta so see what I am supposed to be missing.